function setBg(id) {
	var element = document.getElementById(id);
	var strProperty = ("url(\/art\/images\/vs_house_0" + randomNumber(4) + ".jpg) no-repeat top right");
	element.style.background = strProperty;
	//alert(strProperty);
}
function randomNumber(rangeMax) {
	var randomNumber = Math.ceil(Math.random()*(rangeMax))
	return randomNumber;
}